When we went to the moon and realized that the Soviet Union had no realistic plans of getting to the moon, then we stopped going to the moon.

I can tell you about the universe, but she feels it; and when you feel the universe, it has a whole other meaning to you. Otherwise, you just put a Wiki page on camera. You can learn something, but it won't mean anything to you later on.

The limits on your enlightenment come not from the age you stopped going to school but from the age you stopped being curious.

Any astrophysicist does not feel small looking up at the universe; we feel large.

Most science fiction is about tomorrow, a tomorrow brought to you by innovations in science and technology, and China was worried that if they just have everybody learning what is, they're not going to be in a position to invent a tomorrow because their brain isn't even wired to go in that direction.

Astronomers do not commonly use Venereal, in favor of the less contagious-sounding Venutian. Blame the medical community, who snatched the word long before astronomers had any good use for it. I suppose you can't blame the doctors. Venus is the goddess of beauty and love, so she ought to be the goddess of its medical consequences.

People say, oh we just need charismatic leaders to continue on to Mars. Now we've gone to the moon, of course Mars is next. No. Mars was never, of course, next. It is next if you think we went to the moon because we're explorers, but if you know we went to the moon because we were at war then we're never going to Mars. There's no military reason to do it, to justify the expenditure.